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Evidence

"the specific properties of the copper in this paint, which in some cases has also caused corrosion of the paper (Fig. 5-60)."

Remarks

The paper substrate has suffered physical degradation (corrosion) specifically in areas where copper green was applied for robes and flags (p. 155). This is a well-documented chemical interaction between copper pigments and cellulosic fibers. Additionally, folio 273 and 148 show evidence of extensive destruction and subsequent repainting (p. 164).